Soundproof wall unit



FIG. 1 is a front view of a soundproof wall unit showing the design;

FIG. 2 is a rear view of a soundproof wall unit showing the design;

FIG. 3 is a top plan view of a soundproof wall unit showing the design;

FIG. 4 is a right side view of a soundproof wall unit showing the design;

FIG. 5 is a cross sectional view along the line 5--5 in FIG. 1 of the soundproof wall unit showing the design; and,

FIG. 6 is a perspective view from above and front side of the soundproof wall unit showing the design. 

The ornamental design for a soundproof wall unit, as shown. 